Tekoa, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 2.2 °C (low) to 14.9 °C (high). Annual precipitation averages 522.2 Millimeters. Tekoa is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.8 °C | 2.8 °C | 62.99 mm |
| February | -3.2 °C | 5.2 °C | 43.69 mm |
| March | -1.1 °C | 9.3 °C | 55.63 mm |
| April | 1.4 °C | 13.7 °C | 42.93 mm |
| May | 4.8 °C | 19 °C | 51.56 mm |
| June | 7.7 °C | 22.2 °C | 43.94 mm |
| July | 9.8 °C | 28.5 °C | 16.26 mm |
| August | 9.4 °C | 29.1 °C | 11.94 mm |
| September | 5.8 °C | 23.7 °C | 18.03 mm |
| October | 1.6 °C | 15.5 °C | 40.39 mm |
| November | -1.3 °C | 7.1 °C | 64.01 mm |
| December | -4.3 °C | 2.2 °C | 70.87 mm |
| Annual | 2.2 °C | 14.9 °C | 522.24 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |